Enable buildin bitonic sort (#16919)
Summary:
It now works post ROCm 2.1 release.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16919
Differential Revision: D14018538
Pulled By: bddppq
fbshipit-source-id: c4e1bafb53204a6d718b2d5054647d5715f23243
